2014/10/15 下午 10:15:28
iphone Programming Glossary: unitshttp://stackoverflow.com/questions/12681989/ios-and-finding-tomorrow min secs part and add 1 day then rebuild a date Decompose the date corresponding to now into Year Month Day components units NSYearCalendarUnit NSMonthCalendarUnit NSDayCalendarUnit NSDateComponents comps NSCalendar currentCalendar components units.. NSYearCalendarUnit NSMonthCalendarUnit NSDayCalendarUnit NSDateComponents comps NSCalendar currentCalendar components units fromDate NSDate date Add one day comps.day comps.day 1 no worries even if it is the end of the month it will wrap to the..
How to get the RGB values for a pixel on an image on the iphone http://stackoverflow.com/questions/144250/how-to-get-the-rgb-values-for-a-pixel-on-an-image-on-the-iphone the first element of pixelByteData Essentially what we're doing is making a second pointer that divides the byteData's units differently instead of dividing each unit as 1 byte we will divide each unit as 3 bytes 1 pixel . pixelData RGBPixel pixelByteData..
where to start with audio synthesis on iPhone http://stackoverflow.com/questions/2067267/where-to-start-with-audio-synthesis-on-iphone on iPhone I'd like to build a synthesizer for the iPhone. I understand that it's possible to use custom audio units for the iPhone. At first glance this sounds promising since there's lots and lots of Audio Unit programming resources available... sounds promising since there's lots and lots of Audio Unit programming resources available. However using custom audio units on the iPhone seems a bit tricky see http lists.apple.com archives Coreaudio api 2008 Nov msg00262.html This seems like.. tutorial or recommended tool kit. So anyone here have experience synthesizing sound on the iPhone Are custom audio units the way to go or is there another simpler approach I should consider iphone audio share improve this question I'm also..
What does this ^ syntax mean in Objective-C? http://stackoverflow.com/questions/3499186/what-does-this-syntax-mean-in-objective-c �blocks are an extension to C as well as Objective C and C that make it easy for programmers to define self contained units of work. Blocks are similar to but far more powerful than traditional function pointers. The key differences are Blocks..
Convert GPS coordinates to coordinate plane http://stackoverflow.com/questions/3588653/convert-gps-coordinates-to-coordinate-plane of the building's corners. Let delta_x 320 and delta_y 480 feet let's say . Then vertical_scale delta_y delta_lat with units feet degree latitude horizontal_scale delta_x cos latitude delta_long with units feet degree longitude. The cos latitude.. vertical_scale delta_y delta_lat with units feet degree latitude horizontal_scale delta_x cos latitude delta_long with units feet degree longitude. The cos latitude factor compensates for the varying length of 1 degree of longitude as one moves..
http://stackoverflow.com/questions/3841642/curve-text-on-existing-circle this question I tried to work it out quickly on paper so i may be wrong Convert the length of the string into units on the UnitCircle . Thus string.lenght circle perimeter 2Pi. You now have the angle in radians for the whole string. That..
How many units of each iOS version are currently in usage? [closed] http://stackoverflow.com/questions/4242606/how-many-units-of-each-ios-version-are-currently-in-usage many units of each iOS version are currently in usage closed Anyone know where I can find stats on how many units are currently running.. many units of each iOS version are currently in usage closed Anyone know where I can find stats on how many units are currently running each major version of iOS 1 4 . I'm trying to decide if it's prudent to use functionality only available..
Can example “GLImageProcessing” work with multi filters http://stackoverflow.com/questions/4375479/can-example-glimageprocessing-work-with-multi-filters glTexEnvi GL_TEXTURE_ENV GL_SRC0_ALPHA GL_TEXTURE process 2 adjust contrast t 1.6 GLfloat h t 0.5f One pass using two units contrast 1.0 interpolates towards grey contrast 1.0 extrapolates away from grey Here the general extrapolation 2 Src t Dst.. problem that would do the trick in one pass. Unfortunately the first iPhone's PowerVR MBX GPU only features 2 texture units the minimum required by the OpenGL ES 1.1 standard which would not be enough to apply both filters. I think more recent.. standard which would not be enough to apply both filters. I think more recent hardware can have up to eight texture units and a single pass solution could be found. A more generic approach that will allow you to apply as many filters as you want..
Choose OpenGL ES 1.1 or OpenGL ES 2.0? http://stackoverflow.com/questions/4784137/choose-opengl-es-1-1-or-opengl-es-2-0 of iOS devices in use today support OpenGL ES 2.0 I can't find the statistics on this right now but it was based on units shipped and that number will only grow over time. OpenGL ES 2.0 lets you pull off some stunning effects see Epic Citadel..
How to check what day of the week it is (i.e. Tues, Fri?) and compare two NSDates? http://stackoverflow.com/questions/583692/how-to-check-what-day-of-the-week-it-is-i-e-tues-fri-and-compare-two-nsdate Thanks for any help iphone objective c share improve this question You can use NSDateComponents for this unsigned units NSYearCalendarUnit NSMonthCalendarUnit NSDayCalendarUnit NSCalendar gregorian NSCalendar alloc initWithCalendarIdentifier.. NSCalendar alloc initWithCalendarIdentifier NSGregorianCalendar NSDateComponents components gregorian components units fromDate date then you can access individual parts of the date like this components year components month components day..
How to record sound produced by mixer unit output (iOS Core Audio & Audio Graph) http://stackoverflow.com/questions/7118429/how-to-record-sound-produced-by-mixer-unit-output-ios-core-audio-audio-graph on the I O unit until you get your callback running because a mismatched or unsupported format can prevent the audio units from being linked together. To add the callback try this method AudioUnitAddRenderNotify iOUnit recordingCallback self Apparently.. self Apparently the other methods will replace the node connection but this method will not so your audio units can stay connected even though you've added a callback. Once your callback is running if you find that there's no data in..
Can anybody help me in recording iPhone output sound through Audio Unit http://stackoverflow.com/questions/8615358/can-anybody-help-me-in-recording-iphone-output-sound-through-audio-unit kAudioUnitManufacturer_Apple Get component AudioComponent inputComponent AudioComponentFindNext NULL desc Get audio units status AudioComponentInstanceNew inputComponent audioUnit Enable IO for recording UInt32 flag 1 status AudioUnitSetProperty..
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